Sochi security on lookout for 'Black Widow'

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U.S. on alert for terror in Sochi

Earlier, the news agency said Russian special forces were engaged in two operations in Dagestan, which lies about a 12-hour drive from Sochi on the other side of the Caucasus Mountains.

Security forces killed three more suspected militants in Dagestan on Monday, it reported.

'Black widows'

Meanwhile, a flier handed out by security forces to hotels in Rostov-on-Don, southeast Russia, names three women it says could carry out a suicide attack planned by militant groups between January 21 and 24, during the Olympic Torch Relay.

One of the three, Zaira Nizamudinovna Alieva, was killed in a gun battle over the weekend in Dagestan in which seven militants reportedly died. She had been trained to be a suicide bomber, RIA Novosti cited terrorism officials as saying.

The other two are named as Djannet Kurbanismailovna Tcakhaeva and Oksana Albertovna Aslanova.

The pictures on the flier show two of the three women in Islamic headgear. But its text warns that the women may not be dressed that way.

"Suspected terrorists may use regularly clothing without any Islamic elements, e.g. no long dresses, no hijab, which makes it easier to blend into a crowd, and makes it easier to get access to large gatherings without being noticed," it says.

Sochi suspect

Police have also handed out fliers at Sochi area hotels warning of a woman they believe could be a terrorist and who now may be in the Black Sea resort town.

One flier seen by CNN asks workers to be on the lookout for Ruzanna "Salima" Ibragimova, described as the widow of a member of a militant group from the Caucasus region.

The woman, according to the flier, may be involved in organizing "a terrorist act within the 2014 Olympic region."

CNN obtained a copy of the flier, which is dated January 15, from security staff at a hotel in Sochi. The flier says authorities have received information about Ibragimova's possible arrival in the region last week.

Photos of Ibragimova have flooded television and social media reports from Sochi, and some describe her as a "black widow."